.return_btn{
  color:black;
  font-size: 2rem;
  background-color: white;
  width: 10rem;
  height: 4rem;
  border-right:0rem;

}
#BBS_hblank{
  width: 10rem;
  height: 20px;
  background: white;
}
.BBS_return{
  position: absolute;
  top: 400px;
  width: 10rem;
  height: 35px;
  text-align: center;
  font-size: 21px;
  font-weight: bold;
  background: white;
  color: black;
}
#BBS_search{
  width: 10rem;
  height: 35px;
  text-align: center;
  font-size: 21px;
  background: black;
  color: white;
  float: left;
}
#BBSearch_box{
  width: 235px;
  height: 35px;
}

#BBS_input{
  position: absolute;
  left: 10rem;
  width: 200px;
  height: 35px;
  display: none;
}
.BBSLtab_head{
  position: absolute;
  padding: 5rem 3rem;
  width: 3rem;
  float: left;
  font-size:4rem;
  color:aliceblue;
}
.BBS_leftab{
  margin-top:5%;
  margin-left: 0.1%;
  position: absolute;
  height:40rem;
  width: 10rem;
  background-color: black;
}

.BBS_box{
  padding-left: 13rem;
  display: flex;
  height: 60rem;
  /*background-color: yellow;*/
}
.BBS_context{
  margin-top: 5%;
  margin-left: 2%;
  display: flex;
  border: 0.3rem solid rgba(0, 0, 0, 0.5);
  width: 105rem;
  height: 50rem;
  /*background-color: #006600;*/
}
#BBSimg_box{
  margin: 8px;
  width: 292px;
  height:436px;
  float: left;
}
#BBS_img{
  width: 296px;
  height: 436px;
}
.hotarticle{
  width: 100%;
  height: 10rem;
  /*文字超过3行变成省略号*/
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}
.hotarticle h3{
  text-indent: 0.5em;
  color: black;
}
.hotarticle h4{
  text-indent: 2em;
  font-size: 1.2em;
  color: black;
}
.BBS_article,p{
  overflow: hidden;/*超出部分隐藏*/
  white-space: nowrap;/*不换行*/
  text-overflow: ellipsis;/*省略号*/
  font-weight: 600;
}
.BBS_article:nth-of-type(2){
  margin: 20px;
  float: left;
  /*background-color: #006600;*/
  border-left: 3px dotted black;
}
.BBS_article:nth-of-type(3){
  margin: 40px;
  padding-top:23px;
  padding-left: 15px;
  float: left;
  /*background-color: yellow;*/
  border-left: 3px dotted black;
  border-right: 3px dotted black;
}
.BBS_topic{
  margin: 20px;
  width: 310px;
  height: 38px;
  font-size: 18px;
  border-bottom:1px solid black;
}
#BBS_head{
  font-size: 18px;
  padding-top: 10px;
  padding-left: 20px;
  padding-bottom: 10px;
}
